MaxSite CMS through 109.6 Authentication Bypass via Hardcoded Encryption Key
MaxSite CMS through 109.6 ships with a hardcoded session encryption key in application/config/config.php that is never changed during installation, allowing unauthenticated attackers to forge administrator session cookies. Attackers can mint a malicious ci_session cookie with administrator privileges by computing an HMAC-SHA1 using the publicly known encryption key, bypassing authentication checks in is_login() and mso_check_allow() functions.
CVE-2026-87929
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-87929
MaxSite CMS
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/maxsite/cms",
"vendor": "MaxSite",
"product": "MaxSite CMS",
"versions": [
{
"status": "affected",
"version": "0.78",
"versionType": "custom",
"lessThanOrEqual": "109.6"
}
],
"packageURL": "pkg:github/maxsite/cms",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-87929
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #1608 · Revision 1
- Added to Heist Feed
- Publisher date